© 2005-2016 Nira Control AB 84
5.1.7 Mapping -> Fuel -> Injection Control
Injection Stop Angle
Control the injection stop angle in this table. The angles relate to the TDC
after intake stroke.
Angles near 180 degrees are shortly before the intake valves closes.
Angles near 360 degrees are shortly after the intake valve opens.
Depending on the crank and connection rod geometry the maximum piston
speed is reached in angles smaller the 270 degrees.
Set up proper axes. Start with s small area of cells used. Expand it later or
when/if expansion is needed.
5.1.8 Mapping -> Fuel -> Acceleration
The acceleration system is built up with two imaginary acc tanks that can be
filled by quick throttle opening and drained by quick throttle closing and by
the fuel in the imaginary tanks being injected into the engine. The unit of the
acc tanks is in milligram [mg]. Therefore the amount might need adjustments
based on the engine displacement and type of fuel.
The two different acc tanks are
Fast acceleration tank will be injected during the two first rounds after
the throttle angle has been increased
Slow acceleration tank. Will be injected during a numbers of rounds
after the throttle angle has been increased
Fm Acc Enrich Enable
Enable or disable the Acceleration Enrichment with the label
FM Acc Enrich Enable
Do always start your adjustments with acceleration enrichment disabled.
Adding fuel to a tank
Only a rapid movement of the throttle should add fuel to acc tank. Both FM
Acc Slow & FM Acc Fast uses the Throttle Rate of Cange (ROC) as a
parameter in the table.
Disturbances and small changes of the throttle causes by vibrations can easily
start filling the acc tanks. To avoid this unwanted behavior, set two dead
band rows in the table where no fuel is added.
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